## Monday, 6 February 2017

### [Menu] 6 Feb 2017: Recurring Decimals and Precision of Numbers

Unit 02: Real Numbers: Recurring Decimals
We continued the discussion (after the exploration in last lesson):
• Identifying the repeating pattern
• Look for repeating patterns after decimal point only; start from the first non-zero digit
• For patterns with more than one digit in the repeating pattern, the dot will appear above the digit at the start and at the end of the pattern only
Ethan shared the class how to show 0.9999.... = 1 (Refer to study notes, p2).
Other resource: (Optional) "Un-doing" Recurring Decimals to Fractions

Unit 03: Approximation & Estimation
1. The difference between approximation & estimation
• Approximation: Rounding off of numbers (decimal places; significant figures)
• Estimation: Calculation is involved, usually involving an approximated figure
2. Degree of accuracy (how precise a number is) depends on the context
• Through illustrations

Homework

1. Activity 2: Approximation and Precise Figures: When to use what? (approx. 10 min)
Post one article and comment the choice on the degree of accuracy used by the reporter

2. [Homework] Rounding Off... Decimals (approx. 10 min)

3. [Homework] Approximation: What are the EXTREMES? (approx. 10 min)

4. [Homework] Introduction to Significant Figures (approx. 20 min)

All to be completed online and by 7 February 2017 (Tuesday), 2359

Remember to bring along your Maths Workbook for the next lesson on Thursday.

Please bring along your Homework (last week) on 7 February 2017 - Hao Min will help to collect and deposit the homework in my pigeonhole by recess.

Update: AA1

This is to confirm that:

• The duration of the video clip is capped at 5 min. Any content presented beyond the first 5-min will not be marked
• Remember to acknowledge the resources in the last slide
• Punctuality is important.  Technical issues such as difficulty to upload file due to unavailability of wifi should be addressed before the deadline.
• Late submission (within 1 week): 50% of the marks attained.
• The entire AA1 constitutes to 10% of the overall assessment.